KLM has teamed up with Amsterdam Airport Schiphol to invest in a more sustainable way to operate vehicles at airports. Currently 40 percent of all of the ground vehicles at the airport utilize biodiesel, which, just like the alternative plane fuel, is made from reused cooking oil.

"We have formulated the ambition of running a CO2-neutral operation by 2012, and investment in sustainable mobility is one way in which we will achieve this," said Ad Rutten, Executive Vice President & COO of Schiphol Group.

As part of the pilot program 40 different vehicles — ranging from bird control trucks to delivery vans — will run on 100 percent biodiesel. The pilot program will last for the next four months and, if successful, other vehicles at the airport will eventually make the switch to the fossil fuel-free fuel as well.